a = 1.0;
coarse = 0.1;
fine = 0.01;


Point (1) = {0, 0, 0, coarse};
Point (2) = {0, 0, a, coarse};
Point (3) = {0, a, 0, coarse};
Point (4) = {0, a, a, coarse};
Point (5) = {a, 0, 0, coarse};
Point (6) = {a, 0, a, coarse};
Point (7) = {a, a, 0, coarse};
Point (8) = {a, a, a, coarse};
Point (10)= {0.5*a, 0.5*a, a, fine};



Line (1) = {1, 2};
Line (2) = {1, 3};
Line (3) = {3, 4};

Line (4) = {4, 8};
Line (5) = {4, 2};
Line (6) = {2, 6};
Line (7) = {6, 8};


Line (8) = {8, 7};
Line (9) = {7, 3};
Line (10) = {7, 5};
Line (11) = {5, 1};
Line (12) = {5, 6};

Line (13)= {10, 2};
Line (14)= {10, 4};
Line (15)= {10, 6};
Line (16)= {10, 8};





Line Loop (14) = {10, 12, 7, 8};
Plane Surface (14) = {14};
Line Loop (16) = {11, 1, 6, -12};
Plane Surface (16) = {16};
Line Loop (18) = {5, -1, 2, 3};
Plane Surface (18) = {18};
Line Loop (20) = {9, 3, 4, 8};
Plane Surface (20) = {20};
Line Loop (22) = {10, 11, 2, -9};
Plane Surface (22) = {22};



Line Loop (31)= {14,4,-16};
Line Loop (32)= {5,-13,14};
Line Loop (33)= {6,-15,13};
Line Loop (34)= {7,-16,15};

Plane Surface (31) = {31};
Plane Surface (32) = {32};
Plane Surface (33) = {33};
Plane Surface (34) = {34};








Surface Loop (26) = {22, 14, 16, 18, 31, 32, 33, 34, 20};
Volume (26) = {26};



Mesh 2;
Mesh 3;
OptimizeMesh "Gmsh";
RefineMesh;
OptimizeMesh "Gmsh";

Save "krychle_variable.msh2";